Despite the remarkable advantages of luminescent solar concentrators (LSCs), their application has not been of interest in ultrahigh efficient photovoltaic modules such as multi-junctions and related two-terminal tandems due to challenging issues limiting the cell capability and impeding the output current. Here type of multi-junction LSC photovoltaics is presented that consists of transfer-printed arrays of InGaP/GaAs solar cells and strategically tailored luminescent waveguides. A coplanar waveguide with the non-self-aligned quantum dot luminophores enables simultaneous absorptions of the directly illuminated solar flux and the indirectly waveguided LSC flux, where cell deployment and luminophore spectrum are systematically tuned for balanced enhancement of the subcell photocurrents. Through systematic comparisons across various LSC configurations supported by both experimental and theoretical quantifications, the power conversion efficiency of flexible modules with InGaP/GaAs cell arrays is improved from 1.67% to 2.22% by the optimal LSC, where the module area is 14.4 times larger than the total cell area. The details of optical and mechanical studies provide a further comprehensive understanding of the suggested approach toward multi-junction LSC photovoltaics.
Bibliographical noteFunding Information:
S.H.L. and D.B. contributed equally to this work. This work was supported by National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT under Grant NRF‐2019R1C1C1008201, NRF‐2022R1A5A7000765, NRF‐2021M3H4A6A01048300, NRF‐2022M3I8A2078705, NRF‐2021M3H4A1A02051253, NRF‐2019R1A2C2004846, and NRF‐2022M3H4A1A02074314. Also, this work was supported by the Technology Innovation Program (Development of high‐reliability light‐emitting fiber‐based woven wearable displays) (No. 20018379) and the New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) (No. 20203040010320) granted financial aids from the Ministry of Trade, Industry & Energy, Republic of Korea.
© 2022 Wiley-VCH GmbH.
- balanced subcell photocurrents
- double-junction III-V solar cells
- flexible photovoltaics
- luminescent solar concentrators
- transfer-printing assemblies
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- General Chemistry
- General Materials Science